Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
L 7252 (R)
Improved bran
As is known in the prior art a bran can be obtained from
a cereal by milling the cereal and separating the milled
product into three fractions, i.e~ a white flour, a
bran and the germ. The bran contains most of the
fibres, originally present in the cereal. Attempts to
use the bran in bakery compositions were not very
successful so far, because of the fact that the baked
products made from those compositions did not possess a
good specific volume (= S.V.).
We have now found a method by which the bran can be
improved, 50 that the improved bran can be used
successfully in bakery compositions, while the S.V. of
the baked products made from these compositions is
satisfactory. Therefore our invention in the first
place concerns with a method for improving the
properties of a cereal bran, which is characterised in
that the bran is extracted with an aqueous solution of
an alcohol with 1 to 4 carbon atoms, preferably ethanol
and preferably containing more than 50 wt% ethanol and
more preferably 80-99.9 wt% ethanol, after which the
improved bran is separated from the extract. By
carrying out this extraction some ingredients, which are
disadvantageous for baking performance of compositions
containing the bran are removed. We found that these
components mainly consist of carbohydrates and lipid/
oil, whereas only small amounts of protein and ash are
present in these components.
From DE 3.133.47$ it is known to prepare a flour
additive in particular obtained from maize. Therefore a
milled cereal is treated with a polar solvent, e.g. a
small alcohol, such as ethanol or isopropanol, at about
the boiling point of the solvent. Ln this way proteins
and lipids are removed from the remaining solid. The
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solid can be used as a flour-additive. However nothing
is disclosed about improving a bran and recombing the
improved bran with white flour.
The extraction of the bran is preferably carried out by
using at least a weight ratio alcoholic solvent: bran cf
more than 2, most preferably 2.5 - 3.5. The best
results are obtained, when the bran is subjected to
several extractions steps. In fact we use 2-10,
preferably 3-4 extraction steps.
The bran, that can be used in our process, can be
obtained from any cereal, however in practice we use
brans obtained from wheat, oat, rye and rice.
In order to obtain the bran, that can be treated
according to the process of the invention a cereal is
first milled . The milled product is separated in the
usual way into a white flour fraction and into a bran.
The bran is extracted with 2 or 3 times its weight with
an 80% aqueous alcohol. This extraction procedure is
repeated for another two times, the bran being
separated from the extract after each extraction. This
way an improved bran is obtained. This improved bran is
also part of our invention and can be described as a
standard bran from which the fraction, that is
extractable with an aqueous alcohol, is removed.
The improved bran according to the invention can be used
to make a cereal fibre enriched flour (= modified whole
meal) from which a batter can be prepared.
The improved bran can be mixed with the white flour,
that is separated from the bran when the milled product
is separated, but it is of course also possible to mix
the improved bran with a white flour which is obtained
from another cereal in a separate process.
Examples of white flours that can be used are Snowdon (=
2~38~
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chlorinated flour), Roller White and Stronghold, which
are all obtained from wheat. Advantageously the milled
product is separated into fractions of 70-80 wt% white
flour and 30-20 wt% bran plus the germ. The bran is
treated according to the invention and the improved bran
is remixed with the white flour.
The invention therefore also covers a modified whole
meal, that comprises a white flour and an improved bran,
in particular comprising 70-80 wt% white ~lour and 30-20
wt% of the bran according to the invention. Hereby the
bran can originate from the same cereal as the white
flour or from a different cereal.
Batters can be made by using the improved bran or the
modified whole meal, in which the improved bran is
incorporated.
These batters further contain the usual ingredients.
From the batters baked food products, in particular
cakes, can be made. These baked products possess a
specific volume, as measured by the rape seed
displacement method and calculated as volume per gram
cake, which is about the same as the S.V. for a cake in
which no bran is present.
.
However, when we make a batter, and from that batter a
cake in which we use a standard (untreated) bran in the
same amount as we use our improved bran, we obtain baked
products with a very low S.V.
This will be illustrated by the following examples:
Example I
A dry mix was made from:
644 g Snowdon-flour 42.9
586 g Icing sugar 39.1
112 g Spray dried egg 7.5
2q~3~
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39 g Skimmed milk powder 2.6~
58 g B.V. 40 (= emulsifier) 3.9%
23 g Puron (= baking powder) 1.5~
23 g NaHCO3 1.5%
5 . 4 g Salt 0-4
7.8 g Albumen 0.5%
804 ml water (= 35%) is added to the dry mix and mixed
in a Hobart A 120 for 10 minutes, using a wire whisk.
200 g of the batter is baked at 180C in a standard cake
tin for 20 minutes.
The S.V. of the cake was measured after cooling (24
hours) using the rape seed displacement method. The
S.V. of this cake was 4.5
Example II
Example I was repeated but the Snowdon flour was
replaced by a non chlorinated flour, containing
modified bran.
Crude fibre content of the flour was 2.0 wt%, which is
equivalent to that of whole meal flour.
In table I a review is given of the S.V. of cakes
obtained when using different kinds of flours (Snowdon,
Roller White and Stronghold) per se or in combination
with different brans (fine, superfine, extruded) or in
combination with extracted brans (extruded and
superfine).
In table II a survey is given of the crude fibre content
of the different types of brans, whereas in table III
the amount of material that is removed in the
extraction, using different aqueous ethanol solvent
systems is given.
The level of Spray Dried Egg in table I varies with the
different flours. When a bran was present this level
was increased to 10.2 wt%.
82~D
L 7252 (R)
Table I
Influence of bran on S.V. of cake
Ty~e of flourTYpe of bran % Eqa S.V.
5 Snowdon -- 7.5 4.6
Snowdon fine 10.2 2.9
Roller White -- 7.5 3.0
Roller White fine 7.5 3.5
Roller White fine 10.2 3.7
10 Roller White superfine 10.2 . 3.5
Roller White extruded 10.2 3.6
Roller White * extruded, g9.9%
ethanol extracted 10.2 3.8
Roller White * extruded, 90%
ethanol extracted 10.2 4.2
Roller White * superfine, 90%
ethanol extracted 10.2 4.0
Stronghold - 7.5 4.1
Stronghold fine 10.2 3.6
20 Stronghold * superfine, 90%
ethanol extracted 10.2 4.2
* according to the invention.
Table II
Crude Fibre-content of bran fractions
Bran heat treated cereal native cereal
coarse 7.7% not available
fine 6.6% 7.6%
superfine 3.6% 6.7%
extruded not available 8.8%
Table III
40 Amount of material removed
Solvent Removed
water 8.9
45 ethanol 99.9% 3.0
ethanol 90 % 3.2
ethanol 80 % 5.0
ethanol 55 % 7.4
